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This study was carried out to determine the effect of the discharge of partially treated refinery effluent on the Okrika River. Standard methods were used to determine the physiochemical parameters of refinery effluent. The laboratory analysis results showed that pH was 5.66.06; temperature was 25.6-26.7o-, BOD was 3.36-3.76; COD was 5.165.58 and TDS was 44.7-461 mg/L; The sample results which exceeded DPR standard including odor (objectionable); Turbidity (17-24TU); DO (1.27-3.17 mg/L), Conductivity (68.4-680) and THC (444.2-927.4), as against DPR standard permissible limit of odor (unobjectionable); Turbidity (15TU); DO (4.0-5.0 mg/L) conductivity (N/A) and THC (10); signifying that the River is polluted. This must have lead to observable scanty presence of aquatic life in the River; enhance, rendered the river water not conducive for domestic use. The researchers’ recommended strict adherent to DPR standard permissible limit for effluent discharge couple with routine enforcement inspection to ensure compliance.

Effect of Discharge of Partially Treated Refinery Effluent on the Okrika River